The battle of the Revolutionary War that ensured American Independence occur in Yorktown
The two warring classes of The Communist Manifesto are the bourgeoisie - the capitalists, or the owners of the means of production and the working class, called the proletariat, which works for wages and does not (directly or personally) own the company they work for.
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The company towns reinforced it by having special wages for people of different ethnicity or by racially profiling and segregating those that they didn't want to be equal with Caucasian workers. This caused an even bigger drift between people and distrust to arise.